除非 (chú fēi) means “only if (..., or otherwise, ...); only when; only in the case that; unless”. It is an HSK 5 Chinese word in the HSK 3.0 vocabulary.
除非有紧急情况,否则我们准时开会。
Chúfēi yǒu jǐnjí qíngkuàng, fǒuzé wǒmen zhǔnshí kāihuì.
Unless there's an emergency, we'll have the meeting on time.
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